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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"dryout"”.
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Dryout limits in horizontal annular flow
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Geometry effect on post-dryout heat transfer.
… of channel shape and spacing devices on post-dryout heat transfer has been performed. Overall, very little information is available for these effects, several experiments were carried out covering only limited flow conditions and geometries. To extend the present review, studies with air flow …
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Flow regimes and dryout in horizontal, heated tubes
Thesis (Mech. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Partial singular integro-differential equations models for dryout in boilers
… flow of water and steam, along with the dryout, in steam generating pipes of a liquid metal fast breeder reactor is proposed. The model is based on thin-layer lubrication theory and thin aerofoil theory. The exchange of mass between the vapour core and the liquid film due to evaporation …
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Advanced geometries for dryout mitigation in temhd-driven liquid lithium systems
… and risking damage. This is known as the lithium dryout phenomenon. This work adapts the standard LiMIT trench design to improve heat flux handling and eliminate the presence of lithium dryout on the free surface. Improvements to the design focus on extending the 1-D trench design to 2-D and 3-D …
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The effect of channeling on the dryout of heated particulate beds immersed in a liquid pool
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Experimental investigation of liquid contact in the developing post-dryout CHF flow boiling regime using surface mounted thermistors
… especially immediately downstream of film dryout. These droplets are suspected to provide an important heat transfer mechanism as they impinge on the heated wall. The objective of the current study is to investigate liquid contact with the heated wall in this flow region immediately …
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Analysis of Reverse Flow Restriction Device to Prevent Fuel Dryout During Loss of Coolant and Instability Accidents of Boiling Water Reactors
Made available in DSpace on 2017-07-06T18:55:56Z (GMT). No. of bitstreams: 3 Radaideh_Majdi_I_MS.pdf: 3702916 bytes, checksum: d9ab8cfcddc4314d381232b2ad3af591 (MD5) Radaideh_Majdi_I_MS_ABS.pdf: 113055 bytes, checksum: 6dd5088a2264a7ad7262bf468569a820 (MD5) license.txt: 4813 bytes, checksum: …
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Analysis of reverse flow restriction device to prevent fuel dryout during loss of coolant and instability accidents of boiling water reactors
… The use of RFRD device could prevent fuel dryout damage by preventing excessive high clad temperatures due to sustained dryout without timely rewetting. For LOCA, the device is capable of containing the coolant inside the core during the blowdown and when activating the emergency systems …
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Critical power characteristics of axially heterogeneous tight bundle designs
Accurate prediction of the dryout critical power in fuel rod bundles is challenging and has important implications for the economy and safety of Boiling Water Reactors (BWRs). This is especially true for the tight bundle design of the Resource-Renewable BWR (RBWR) proposed by Hitachi, Ltd. Unlike a …
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The effect of drop concentration on deposition in vertical annular two-phase flow
… This deviation causes concern when predicting dryout in two phase applications. To better understand this process, information on its drop size and on the behavior of drops in the turbulent gas flow are needed. Experiments were conducted in a 4.2 cm vertical pipe at an upward superficial gas …
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Comprehensive modeling of thin film evaporation in micropillar wicks
… heat flux that can be reliably sustained (the dryout heat flux) has been well-characterized for many wick configurations, key design information is missing as many previous models cannot determine the distribution of evaporator surface temperature nor temperature at the evaporator's interface …
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Flow control and associated technologies to advance the application of TEMHD-driven liquid lithium in fusion devices
… attainable once used with large heat fluxes. The dryout phenomenon, where high local acceleration of flow depresses lithium surfaces and exposes the solid trenches, is investigated via multiphysics modeling. The models developed recreate experimental observations, and were used to predict that a …
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A Composite Heat Transfer Model of the Film Boiling Regime
… and the subsequent duration of the liquid dryout period. Additionally, assuming that liquid propagation along the surface is terminated at the inception of nucleate boiling, an expression is developed to predict the wetted area of contact at a given node site. The hydrodynamic and surface …
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Advancement of closure relations for annular flow modeling in CFD
… and prevent the threatening occurrence of dryout. The accurate prediction of the complex multidimensional liquid film behavior in advanced BWR fuel assemblies is critical to guarantee improved reactors performance and safety. Multiphase- CFD (M-CFD) brings the ability to model the complex …
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Thin-film evaporation from well-defined silicon micropillar wicks for high-heat-flux thermal management
… designed to investigate the capillary-limited dryout heat flux by ensuring pure thin-film evaporation in the absence of nucleate boiling. The tests were performed in a temperature controlled saturated vapor environment to accurately control the operating conditions. We also developed a unified …
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Electrostatic control and enhancement of film boiling heat transfer
… flux (CHF); higher heat fluxes lead to surface dryout and temperature excursions. An externally applied electric field in the vapor layer can significantly enhance boiling heat transfer for electrically conducting or polar liquids. In such liquids, the electric field is concentrated in the vapor …
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Experimental study of drying of a porous medium at sub-residual saturations
… balance. These showed localized evaporation and dryout phases. Generally the lower temperature cases showed good comparison between the humidity-based calculations and the digital balance readings. At higher temperatures an initial large drop in mass was indicated which was not shown from the …
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Rayleigh Flow of Two-Phase Nitrous Oxide as a Hybrid Rocket Nozzle Coolant
… exchange model for predicting whether or not dryout occurs. The Shah correlation is used to predict heat transfer coefficients in the nucleate boiling regime. The homogeneous flow model is utilized to predict pressure drop. It is proposed that a Dittus-Boelter based correlation much like that …
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Measurement of near-surface void fraction and macrolayer thickness in boiling water and silica-based nanofluid
… velocity in water and R-123. The macrolayer dryout theory of CHF was tested by investigating the change in macrolayer thickness for different heat fluxes in de-ionized (DI) water and 0.01% (by volume) SiO₂nanofluid. A current controlled power source heated a sandblasted, stainless steel plate …
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